Wieters said he began feeling tightness in his arm going into his first at-bat Thursday and it grew worse throughout the game, especially on the tail end of his left-handed swings. He said the tightness has no impact on his throwing.

"That's the main reason why I was able to stay in the game, because I still felt I could throw fine and be able to help the team defensively somehow," he said. "Hopefully a day of treatment will knock it out and I'll be ready to go."

Wieters said he's never felt the soreness before.

"It's not really a concern," Wieters added. "We think it's just something that's a little bit of tightness that everybody gets over the course of a season."

Wieters, who said his slump had nothing to do with sitting out Friday's game, spent pregame in the Orioles video room watching film with special hitting instructor Terry Crowley. He said he hoped a day off would help him break out of his slump.

"I hope so," Wieters said. "Been watching video all year, just trying to get that swing locked in. Hopefully today I can just get more [away from the] mental strain and try to figure out the swing a little bit and be ready to go tomorrow."

Wieters, who is hitting .197 (14-for-71) with just three extra-base hits in the month of July, had been the Orioles' starting catcher in 80 of their 99 games this season heading into Friday.

Taylor Teagarden will catch in Wieters place, the second straight time he will catch left-hander Zach Britton, who threw six shutout innings against Cleveland in his last outing.

Orioles second baseman Robert Andino, currently on the 15-day disabled list with a left shoulder strain, appears far ahead of schedule in his recovery and could rejoin the team when he is eligible to come off the DL on Tuesday.

A look at significant trades that have been completed across baseball since late June. Check back to keep up with all the big moves as the July 31 trade deadline approaches. (Information from various reports included.)

For all the flashes of promise that Chris Tillman has shown the Orioles, up until now they've been just that, shimmers of brilliance in between chapters of unfulfilled potential. Since making his major league debut three years ago at the age of 21, Tillman has tantalized Orioles fans with...